Quick stop arrangement for a tape recorder/reproducer



F. LOUZIL Nov. 1, 1966 QUICK STOP ARRANGEMENT FOR A TAPE RECORDERREPRODUCER Filed July 8, 1964 3 Sheets-Sheet 1 INVENTOR.

FRIEDRICH LOUZIL AGENT Nov. 1, 1966 F. LOUZIL. 3,282,522

QUICK STOP ARRANGEMENT FOR A TAPE RECORDER REPRODUCER Filed July 8, 19645 Sheets-$heet 2 INVENTOR.

FRIEDRIC H LOUZIL AGENT Nov. 1, 1966 F. LOUZIL 3, 2

QUICK STOP ARRANGEMENT FOR A TAPE RECORDER REPRODUCER Filed July 8, 19645 Sheets-Sheet :5

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INVENTOR.

FRIEDRIC H LOUZIL AGENT United States Patent M 3,282,522 QUICK STOPARRANGEMENT FOR A TAPE RECORDER/REPRODUCER Friedrich Louzil, Vienna,Austria, assignor to North American Philips Company, Inc., New York,N.Y., a corporation of Delaware Filed .luly 8, 1964, Ser. No. 381,152Claims priority, application Austria, July 16, 1963, A 5,678/63 6Claims. (Cl. 24255.12)

Recording and/ or reproducing apparatus are often provided with aso-called quick-stop key, i.e. a control-member which permitsinstantaneously interrupting movement of a record carrier and ofrestating it respectively. The advantage of such a device as is known,in that it is not necessary for the capstan drive to be switched off butthat only certain parts are put out of operation. Such a device hasheretofore quick response.

The present invention relates to a device for the instantaneousinterruption of the movement of a tape by the means of a separatecontrol-member in the form of a quick-stop key in recording and/orreproducing apparatus, in which the tape coming from a supply spool isdriven by a driving shaft, against which the tape is urged, in itsoperating condition, by a pressure roller arranged on an adjustablesupport, which roller is lifted by means of the control-member forabrupt interruption of the tape movement.

In accordance with the invention the support is adjustable via one ormore transmission members by means of an electro-magnet, one of thetransmission members having rotatably fastened to it a lever, whichco-operates with a brake for the support of the supply spool andfurthermore provision is made of a supporting member for said lever,which supporting member is adjustable by said control member and which,when the electro-magnet is energized, the control-member, applies thebrake and lifts the pressure roller from the driving shaft or capstan.

The advantage of the device according to the invention resides not onlyin its structural simplicity but also in that the electro-magnet remainsenergized, when the control member (quick-stop key) is actuated. Ascompared with a conventional stop key, with which the electro-magnet isde-energized, the quick-stop key lifts the armature of the magnet andthe pressure roller only a small amount from the magnet core and fromthe driving shaft respec tively. For regaining its operational position,the pressure roller need cover only a small distance, the full power ofthe electro-magnet being immediately available, so that this operationtakes a minimum of time.

Since in the device according to the invention the electro-magnetremains energized, this device is particularly advantageous forapplication in apparatus in which the electro-magnet in the operatingcondition which the tape travels at normal speed serves not only foractuating the pressure roller but also for other functions in the sameoperating condition, for example for actuating main brakes, forswitching on a slip coupling for driving the winding up reel and so on.

The invention will be described hereinafter more detailed by way ofexample with reference to embodiments shown in the drawing, and withoutrestricting the scope of the invention to these embodiments.

The drawing shows diagrammatically various devices according to theinvention. Only those parts are shown, which directly relate to theinvention.

FIGS. 1, 4 and 5 are diagrammatic views which show devices in which forthe supply spool a separate brake is provided to be actuated by a quickstop-key. These three figures show the positions of the parts in thenon-actuated state of the quick-stop key, when the electro-magnet3,282,522 Patented Nov. 1, 1966 2 is not energized (pressure roller isfree of the driving shaft).

FIGS. 2 and 3 are diagrammatic views which show for the device of FIG. 1the positions of the parts when the quick-stop key is not actuated andthe electro-magnet is energized (pressure roller is in cont-act with thedriving shaft) and when the quick-stop key is actuated and theelectro-magnet is energized respectively.

FIG. 6 shows a device in which a quick-stop brake is provided in a mainbrake system, braking the supply spool when switching over to adifferent operating condition or for stopping the travel of the tape.

Corresponding part or parts having corresponding functions aredesignated in the figures by the same reference numerals.

In the device shown in the figures the pressure roller 1 which has to bepressed against the caps-tan 2, is arranged on a lever 4, adapted toturn in a bearing 3. The lever is turned with the aid of a connectingrod 6, fastened to the lever 4 at the pivotal point 5. The movement ofthe armature 7 of an electro-magnet 8 is transferred to rod 6 by meansof a lever 9. The current circuit of the electro-magnet 8 includes acurrent source 10 and a working contact 11, which is closed by acontrol-member (not shown) and which, when closed, switches on the tapedrive, thereby performing, together with the urging of the pressureroller 1 against the driving shaft 2, the further mechanical andelectrical operations required for attaining the corresponding operatingcondition, for example switching on the drive of a take-up spool andlifting various brakes. The connecting rod 6 carries at 12 a lever 13,which is provided with a brake 14, said brake is actuated by turning thelever 13 against the periphery of the flywheel 15 of the supply spool.The lever 13 extends transverse in respect of the rod 6 and is held inthis position by a stop 16 and a spring 17. Thus the lever 13 can beturned only to that side where the brake 14 is provided. A spring 18determines the rest position of the whole system, whenthe magnet 8 isnot energized (working contact 11 is open).

The quick-stop key 19 is connected through a pull connection 22 (FIGS.1,4 and 6) or a push connection 23 (FIG. 5) (rod or Wire or the like)with a support 20, for example a hook. When the key 19 is actuated, thesupport 20 is shifted in the direction of the arrow 21 and arrives atthe lever 13. A stop 22a limits the possibility of movement of thequick-stop key 19.

As stated above, FIG. 1 shows the device in the rest position, i.e. thepressure roller is lifted and the quickstop key is not actuated.

In order that the pressure roller 1, when the magnet 8 is energized, isurged against the driving shaft 2, so that the operation position ofFIG. 2 is obtained, the connecting rod 6 must shift with the pivotalpoints 5 and 12 over a distance h. The lever 9 can be given easily suchdimensions that the complete stroke of the armature 7 corresponds to adisplacement of the rod 6 over said distance h. The lever 13 can followthe displacement of the rod 6 in carrying out a translation movement aslong as the quick-stop key 19 is not actuated (FIG. 2). It is notnecessary for the support 26 to allow, when the quick-stop key is notactuated, a translation movement of the lever 13. The lever 13 can comeinto contact with the support 20, when the armature is lifted, and canthus be rotated. It is only essential that the lever 13 should bepivoted to an extent such that the brake 14 does just not becomeoperative.

When, in the operating position, (FIG. 2) the quickstop key is actuated,the lever 13 is first pivoted around the fulcrum 12 under the pressureof the support 20 to an extent such that the brake 14 engages theperiphery of the flywheel 15, after which the lever 13 is rotatedfurther with the brake 14 as a fulcrum until the support 29 has reachedthe final position determined by the stop 22a. The rod 6 is carried overpart of the distance 71 against the force of the magnet 3 so that thepressure roller 1 is just lifted from the driving shaft 2 (FIG. 3). Thearmature 7 of the electronagnet 8 is lifted only over a small distancefrom the magnet core owing to the transmission ratio of the leverage 4,6, 9. When the key 19 is released, i.e. when the pressure roller isbrought again in contact with the driving shaft 2, the pressure rollerneed move only over a small distance and to this end the full force ofthe electro-magnet is immediately available, so that this operation iscarried out with minimum time.

The device may be varied conveniently in different ways. In the deviceshown in FIG. 4 the lever 13 is formed by a two-armed lever or firstclass lever. In the device shown in FIG. the quickstop key 19 acts onthe support 20 via the push-rod 23. In both cases the stop 16 (FIGS.1-3) is omitted. The efiect of the spring 17 on the lever 13 is thuslimited by the support 20. Also the device shown in FIG. 1 can becarried out in this way. As stated above, FIGS. 4 and 5 show thepositions of the parts, when the electro-rnagnet is de-energized and thequick-stop key is not actuated.

In the device shown in FIG. .6 one-arrned levers 25a and 25b areprovided as brakes for the flywheels 15 and 24 of a supply spool and atake-up spool respectively, the ends of said levers being provided withbrake coatings 26a and 26b respectively. The brakes are actuated bymeans of a T -shaped operating member 27, which is drawn in thedirection of the arrow 28 by an associated control-member (not shown),when the tape movement is stopped. When the operating member 27 isshifted back, i.e. when the tape movement is switched on, the springs29a and 2% release the brakes. This position is shown in FIG. 6 for theforward travel with normal speed of the tape. The magnet 8 is thenenergized and the pressure roller 1 engages the driving shaft 2. Thelever 13, as in the other embodiments, is actuated by means of thesupport 20 of the quickstop key 19 (shown in FIG. 6 in its restposition) and acts with its free end 30 on the lever 25a When thequick-stop key 19 is actuated, first the lever 13 and then the lever 25aare turned. When the coating 26a engages the flywheel 15, the end 30 ofthe lever 13 is fixed and a further movement of the support 20 in thedirection of the arrow 21 results in a turn of the lever 13 about thefulcrum 30 and hence the pressure roller is lifted from the drivingshaft 2.

What is claimed is:

1. A quick stop arrangement for a tape recorder/reproducer having a tapesupply means, a capstan and associated pressure roller for driving thetape of said recorder/reproducer, comprising a first means moveablysupporting said pressure roller, a brake for engaging said tape supplymeans, a second means for moveably supporting said brake, a moveablemember connected with said first means and pivotally connected with saidsecond means, an energy source and means interconnecting said source andsaid movable member for imparting a first movement thereto whereby saidbrake is released and the tape is driven, a quick stop manually operatedkey means, said key means being connected with said second means forpivoting said second means relative to said move-able member, andsubstantially simultaneously moving said movea-ble member for separatingsaid pressure roller and said capstan.

2. A quick stop arrangement for a tape recorder/reproducer according toclaim 1 wherein said second means comprises a first lever having a brakematerial attached to one end, a fixed pivot means connected with theother end of said lever, a second lever engaging said first lever formoving said brake into brake applied position, and said second leverbeing pivotally connected with said move able member.

3. A quick stop arrangement according to claim 1 with the addition of anadjustable stop coupled with said second means for determining theangular position of said second means relative to said moveable member.

4. A quick release arrangement for a recorder/reproducer having a tapesupply means comprising a capstan and pressure roller for driving thetape of said rccorder/ reproducer, a first pivotal lever connected withsaid pressure roller, a brake means operatively connected with said tapesupply means, a second pivotal lever connected with said brake menas, anenergy source including a shiftable connecting rod, said first andsecond levers being pivotally connected with said connecting rod forapplying said brake and separating said pressure roller and capstan uponmovement of said connecting rod in one direction of movement thereof andvice versa in the opposite direction of movement of said connecting rod;and a quick stop means comprising a moveable member operativelyconnected with said second lever for sequentially pivoting said secondlever relative to said rod for applying said brake means and pivotingsaid lever about said brake means for moving said rod for separatingsaid pressure roller and capstan.

5. A quick release arrangement for a recorder/reproducer according toclaim 4 wherein said second lever comprises a first class leverpivotally connected with said rod at the fulcrum and having said brakemeans at on end, the other end of said lever being operatively connectedwith said moveable member.

6. A quick release arrangement for a recorder/reproducer according toclaim 4 wherein said brake means comprising a third lever fixed at oneend for pivotal movement and having a brake band fixed to the other end,said second lever being operatively connected with said third leverbetween said ends.

References Cited by the Examiner UNITED STATES PATENTS FRANK J. COHEN,Primary Examiner.

LEONARD D. CHRISTIAN, Examiner.

1. A QUICK STOP ARRANGEMENT FOR A TAPE RECORDER/REPRODUCER HAVING A TAPESUPPLY MEANS, A CAPSTAN AND ASSOCIATED PRESSURE ROLLER FOR DRIVING THETAPE OF SAID RECORDE/REPRODUCER, COMPRISING A FIRST MEANS MOVABLYSUPPORTING SAID PRESSURE ROLLER, A BRAKE FOR ENGAGING SAID TAPE SUPPLYMEANS, A SECOND MEANS FOR MOVABLY SUPPORTING SAID BRAKE, A MOVEABLEMEMBER CONNECTED WITH SAID FIRST MEANS AND PIVOTALLY CONNECTED WITH SAIDSECOND MEANS, AN ENERGY SOURCE AND MEANS INTERCONNECTING SAID SOURCE ANDSAID MOVABLE MEMBER FOR IMPARTING A FIRST MOVEMENT THERETO WHEREBY SAIDBRAKE IS RELEASED AND THE TAPE IS DRIVEN, A QUICK STOP MANUALLY OPERATEDKEY MEANS SAID KEY MEANS BEING CONNECTED WITH SAID SECOND MEANS FORPIVOTING SAID SECOND MEANS RELATIVE TO SAID MOVABLE MEMBER, ANDSUBSTANTIALLY SIMULTANEOUSLY MOVING SAID MOVABLE MEMBER FOR SEPARATINGSAID PRESSURE ROLLER AND SAID CAPSTAN.